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8500935C TT231-0600 User`s Manual

1. PERSONAL COMPUTER ae BUNNING WINDOWSE DS MODEL TT2XX TRANSMITTER HOST PC RUNNING ACROMAG USB MiniB MALE CONFIGURATION CABLE Model 4001 113 SOFTWARE O USB MiniB Socket m Front Panel of Module N co SS Note Output Power to Transmitter must be applied before USB connection See Output Power Connections HOST TO HOST USB PORT USB 2 H yy Oo m Lo USB ISOLATOR USB ANALE RECOMMENDED HOST USB SERIAL NN PORT CONNECTOR Acromag i AT BACK OF PC 1 METER CABLE 8 IL A i k aE D CABLE Model 4001 112 S DNH USB B MALE LED O rower connection USB A MALE Refer to Configuration Software Kit Model TTC SIP which includes 1 ea Model 4001 113 USB Cable 1 ea Model 4001 112 USB Cable 1 ea Model USB ISOLATOR 1 ea Model TT CONFIG CDROM Software MODEL NO USB ISOLATOR e USB Signal Isolation is Required See Below You may use Acromag model AN USB ISOLATOR to isolate your USB port or you can optionally use another USB signal isolator that supports USB Full Speed operation 12Mbps WARNING The intent of mating e Configuration Requires USB and Loop Power This transmitter draws power USB with this transmitter is so that from both the current loop and from USB during setup it can be conveniently setup and e Connect Loop Power Before USB Always connect the t
2. Includes a USB socket for temporary connection to a PC or laptop for the purpose of setup and reconfiguration USB isolation is required when connected to a grounded input sensor or driver see note at right During reconfiguration and calibration the transmitter receives power from both the USB port and the output loop Both power sources must be present to calibrate the unit CAUTION Do not attempt to connect USB in a hazardous environment Transmitter should be setup and configured in a safe environment only Data Rate USB v1 1 full speed only at 12Mbps Up to 32K commands per second USB 2 0 compatible Transient Protection Adds transient voltage protection on USB power amp data lines Inrush Current Limiting Includes series inrush current limiting at USB power Cable Length Connection Distance 5 0 meters maximum Driver No special drivers required Uses the built in USB Human Interface Device HID drivers of the Windows Operating System Windows XP or later versions only USB Connector 5 pin Mini USB B type socket Molex 67503 1020 PIN DEFINITION 5V Power Includes Inrush Current Limiting Differential Data Differential Data NC Not Connected Power Ground Connects to Signal Ground via ferrite bead Signal Ground Connects directly to Signal Ground 1Note Most Host Personal Computers except battery powered laptops will connect earth ground to the USB shield and signal ground A
3. USB TO SPI CONVERTER EEPROM TWO WIRE OUTPUT TB3 6 SCHOTTKY BRIDGE 9 32VDC 4 20 4 EARTH E GROUND fei Doan 8 8 PI amp CTRL CIRCUITS 1 Osc SCLK Sp PASS TRANSISTOR i D D U U D D l U D 1 e LEADS MUST BE SAME LENGTH DAG 1 193V oE i TYPE AND SIZE FOR LEAD H REFERENCE I POLARITY J5 COMPENSATION i in y Lt i PROTECTION 493uA 493uA DAG i TBA Fd Al REF1 REF2 MATCHED 1 is D REF REF2 36V C CONNECTIONS ARE USED SUB AES ATOR 1 A FOR OPTIONAL SOURCED AR Leli _ p vs WIRING CONNECTIONS MUX e DAC H Ze TBI OUTPUT CURRENT AMP D NC Q J N Vo 1 Vo 6340 THERE ARE NO INTERNAL H 4 PGA eg h H CONNECTIONS TO C TERMINALS 8 2 D PtRTD oo o i H MUX LINEARIZER H FILTERING OMITTED FOR CLARITY IN L vi CIRCUITRY H gt CG t T 1 i taoma lout 50 V0 6340 a en U RTD INPUT ow i HI GR H TB2 We ee nn nn en en ee ee ee H IN oF aS o 493uA wan S SI gif Rz sets input range zero i lt A C Rz forces diff input voltage near 0 at Tmin Cu Duo Beet Du og6uA 3 50 0C OF m 6 34K gt 7 x x k Rem V com 0 467V e al 3 WIRE RTD CONNECTION 475 l Es aly Nea Vrone l l Rem sets a positive bias within common mode voltage range COMMON MODE VOLTAGE OF IR DROP IN EACH LEAD IS REJECTED BY TR
4. amp Linearizer Calibration Procedure 1 After configuring your input type and I O ranges you can begin calibrating the transmitter by clicking the Start Calibration button and the following message will appear 17231 Config A Step 1 Zero calibration Please set your input resistance to 100 00 Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field Your unit needs to calibrate its zero signal The software used your input type and alpha information to compute the equivalent RTD resistance of the input zero value you specified and returned that value in this prompt Click OK and this message is repeated in the system message window at the bottom of the screen Adjust your input signal to the zero input value noted Because this input is a Pt 100Q sensor and 0 C is our input zero our input signal should be precisely set to 100 00 ohms Measure the corresponding output current and type the measured current in milliamps into the Measured Current Output field Then click the Go To Step 2 button 2 After clicking Go To Step 2 the following message will be displayed Acromag Inc Tel 248 295 0880 T7231 Config A Step 2 Full scale calibration Please set your input to 175 86 Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field Now the unit needs to calibrate its gain to produ
5. connecting or entering incorrect signals will produce an undesired output response IMPORTANT If you make any changes to the Configuration parameters you must re calibrate your input Any changes to the Input Type Sensor Wiring Input Zero Full Scale or Output Zero Full Scale are not written to the transmitter until you complete the calibration sequence that is initiated by clicking the Start Calibration button You can use the Get Config Calibration control button to read the current configuration of the unit if you like perhaps to determine the active configuration prior to recalibrating it Note that it will over write the configuration parameter selections of this screen that you may have just changed It a good idea to always check the current configuration selections to affirm your intentions before clicking Start Calibration After making your input type and I O range selections you can click the Start Calibration button of the Calibration section to begin calibrating your selections Calibration is a simple two step process Resistance Input or three step process Pt RTD Input that adjusts the I O range zero the PGA gain and excitation and linearization Pt RTD only If you make a mistake and need to repeat a step just click Abort Calibration to restart from the beginning Calibration is an interactive process in which the software prompts you to apply input signals and then measure the c
6. output current linear to sensor resistance The output signal is transmitted via a two wire 4 20mA current loop The two wire current signal can be transmitted over long distances with high noise immunity Sensor lead break detection and the inherent 4mA live zero output offers convenient I O fault detection should an I O wire break Extra connections at the output of this model allow it to be optionally wired for a sourced 4 20mA output configuration see Output Power Connections Acromag Inc Tel 248 295 0880 4 http www acromag com Model TT231 0600 Mechanical Dimensions Units may be mounted to 35mm T type DIN rail 35mm type EN50022 and side by side on 0 5 inch centers WARNING IEC Safety Standards may require that this device be mounted within an approved metal enclosure or sub system particularly for applications with exposure to voltages greater than or equal to 75VDC or 5OVAC Two Wire RTD Transmitter w USB Le 99 0 gt el 12 5 lt 3 90 0 50 A og a Ge Ve 114 5 4 51 DIMENSIONS ARE IN MILLIMETERS INCHES DIN Rail Mounting amp Removal Acromag Inc Tel 248 295 0880 Refer to the following figure for attaching and removing a unit from the DIN rail A spring loaded DIN clip is located on the input side bottom
7. sssssssunsnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 12 QUICK OVErVIEW Eege eege eebe eebe 12 TECHNICAL REFERENCE OPERATION STEP BY STEP sssssssunsnnnnnnnunnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 14 COMME CTONS vscissssssesavonionervossannysessstesernnesensendethasnibanswcoedetiannenskueontsshaansseeiniinnkesinnonasnuavantatents 14 C ntig ratiOM Panne ene nn enone enn ern eee re en ere eee eee ret 15 Calibrate I O Range Selection EEN 19 Zero Full Scale amp Linearizer Calibration Drocedure ccccccccccccccsceccccsseeceseeeceeeeeeseeuueueeeeeeseueeas 20 Pt RTD Resistance Versus Temperature Table ccccccccccsssssssececececsssessesecececssseseaeaeeeeeeessesenaeas 22 Over Scale amp Under Scale Thresholds cccccsssessssseecececcccececsesecececececeacecseseeeeeeseeeeauecsenes 23 Break Detection s es cresrissssessooonsesnesesssio kuuni nemedon aKa E Eunos anani NEVEKEN ENKEN NONEK Eae Senara a Nakas 24 IK d CET 24 Reset Unit TT 25 Restore F ct ry Settings ccs cs fcsiccescicieiecdssdecsed ccuivedewtedbulucdeevdsedessedpevedenccstusercosseccsssveessrceedede 25 Acromag Inc Tel 248 295 0880 2 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB HOW Tt WOKS i cdi caced ciccdis sedan scerdaancuauelaatscccesddoiccecacencbeascaavadavace EEGENEN E e 27 TROUBLESHOOTING west ecient icin cent niet eo Diagnostics Table ue Seugiegeeeerg ue Eege eh DEAENN gege sbazenduaund cout
8. 0880 28 http www acromag com Model TT231 0600 How It Works Two Wire RTD Transmitter w USB The zero point of the calibrated input range is set via a zero resistor Rz connected in series in the minus input lead From the factory three resistance values are installed in three separate minus lead paths and are at ohm values just below that of a 100Q Pt RTD corresponding to temperatures 50 C 0 C and 0 F For two wire sensor connections only a 0 C input range zero may be selected The voltage drop produced in Rz drives the differential voltage measured across the sensor to be near zero at Tmin of the RTD range as the excitation current in each lead is matched The combined excitation current of each lead is then shunted into a 4750 common mode resistor Rcm producing a positive bias for the input sensor within the input common mode range of the differential amplifier as it ensures that the lowest common mode input voltage is greater than the minimum range limit of the amplifier The units excitation currents are digitally adjustable via the Iref DAC From the factory this current is set to a nominal value of 493uA via the 12 1K Rset resistor 480uA to 510UA range It can be digitally adjusted to other levels during calibration The excitation current values are also influenced by the linearity DAC All RTD s have a nonlinear response over temperature that is approximated by a quadratic equation The linearity DAC uses positi
9. Seaceiusuwedenstubaaeddeauwiechstanseds 30 Service amp Repair Assistant sees dee ee Ce EE REENEN ee 33 Software Interface Package ven iisciscsssesdstecenssdsunussdccnvossectsvesnesiaccahsdsstedudecsstnbscecussuselsssescdausess 34 ISB SGIAE ON eege Ee 34 USB A B Cable is ed iznapsonnvesnuebsinassnnsanentenssniceventuwatestsdanehiievesuasbonraesarsnendcnbabasniaramentes ra EEEa 34 USB A mini B Cable 55 stds 5 anata cya lags us vn banavesedsaanactavadc sss EE 34 Mod l N mer geen 35 eE e E FAE E A A EA R 35 Output E 37 RI Cen enere aeaa enas EEEE EEE Ea EAE TOES UEaren EE KERGED ETENEE DERE 38 Enclosure amp Physical neare Eed 39 Tun EN 39 Agency Approvals eeh 40 Reliability Pregiction is Steeg 40 Configuration eu dd E A0 REVISION HISTORY E al All trademarks are the property of their respective owners IMPORTANT SAFETY CONSIDERATIONS You must consider the possible negative effects of power wiring component sensor or software failure in the design of any type of control or monitoring system This is very important where property loss or human life is involved It is important that you perform satisfactory overall system design and it is agreed between you and Acromag that this is your responsibility The information of this manual may change without notice Acromag makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular
10. amp Alarm Levels e Select the output under scale and over scale thresholds to define your linear output operating range e Indirectly sets the upscale and downscale fault limits outside of your linear operating range to 1mA above over scale and 0 4mA below the under scale threshold settings Use these controls to define the linear operating range of the output and its associated alarm limits Once you have made your selections you can click the Submit U O Configuration button to engage your settings Break Detection Sets Direction of Output Upon Fault e Select output Downscale or Upscale lead break or sensor fault detection Use these controls to set the direction that the output should go if a sensor lead breaks Then click the Submit Break Detection button to write your selection to transmitter memory Then a lead break or sensor burnout fault will send the output to the upper or lower alarm level according to this setting Alarm levels are set outside of the linear output operating range to 1mA above the over scale threshold or 0 4mA below the under scale threshold Factory Settings In Case of Trouble e Restores a transmitter to its original factory calibration e Restores a transmitter to its initial factory configuration You can click the Restore Factory Settings button if you ever misconfigure or miscalibrate a transmitter in such a way that its operation appears erratic Unit Status For Validation
11. amp Trouble Shooting e Tests the integrity of your USB connection to the transmitter e Reads the Fault Status of your input signals with respect to input amp e Resets the transmitter sets it to its power up configuration Use the Read Status control to test communication and obtain diagnostic information relative to the input Input Fault Status messages will be returned on the Fault Status line and in the system message bar at the bottom of the screen Optionally use the Reset Unit control to revert to the power up or stored configuration or to clear a checksum error Refer to Read Status of the Operation Step by Step section for more information Message Bar Bottom of Screen e Displays the Fault Status message of your input signal see above e Displays other prompt instructions during calibration The system message bar at the bottom of the screen will display amp repeat prompt instructions as you step through calibration It also displays diagnostic messages after clicking Read Status 13 http www acromag com Model TT231 0600 TECHNICAL REFERENCE OPERATION STEP BY STEP Two Wire RTD Transmitter w USB Connections This section will walk you through Note Your input source and output meter must be accurate beyond the unit the Connection Configuration specifications or better than 0 1 A good rule of thumb is that your equipment Calibration process step by step source accuracy shou
12. and you measure a voltage drop across the sensor then sensor value is likely out of range or unit has been miscalibrated Output goes 0 4mA below selected Under Range Value URV This is the Down scale alarm level and indicates the input signal exceeds the common mode range of the input This can also occur if the third sensor wire is missing 3 4 wire RTD a lead has broken the sensor has burned out or open or the jumper between terminals 3 amp 4 of the transmitter is not installed 2 wire RTD A Downscale alarm level is driven by a sensor fault open sensor or broken lead with lead break detection set downscale It can also be triggered by a very high sensor resistance that looks open to the transmitter Check sensor resistance sensor connections and your connection to input terminal 4 to restore input operation You can check your sensor connections by measuring a voltage drop across your input resistance equal to 0 5mA Sensor_Ohms If connections are OK and you measure a voltage drop across the sensor than your sensor value is likely out of range or the unit has been miscalibrated Output goes 0 4mA below the lowest possible Under Range Value An output level 0 4mA below the lowest URV setting can be indicative of a checksum error encountered in a data exchange with the internal EEPROM memory This assumes that you have not configured an Under Range Value to its lowest setting 31 This is
13. connection before completing calibration the EEPROM checksum value could be corrupted and this would inhibit normal operation Alternately this button can be used as a sanitation tool to restore the unit to its initial configuration Note that the Reset Unit control of Unit Status sends the unit to its power up or stored configuration different from this control which sends the unit to its initial factory configuration Acromag Inc Tel 248 295 0880 25 http www acromag com Model TT231 0600 Message Bar Two Wire RTD Transmitter w USB The system message bar at the bottom of the screen will display amp repeat prompt instructions as you step through I O calibration It also displays diagnostic messages For example Error Input Zero can only accept whole numbers Error Input Span can only accept whole numbers Error Output Zero accepts positive numbers with up to 4 decimals Error Output Zero accepts positive numbers with up to 4 decimals Error Input must be less than 850 C Error Input must be less than 1562 F Error Output Zero must be between 3 5 and 6mA Error Output Full Scale must be between 16 and 24mA Error during calibration Please increase range and try again Error during calibration Please lower your input zero or increase your full scale value Error during calibration Please raise your input zero or increase your full scale va
14. of your particular RTD curve e Set the RTD Temperature Units e Set the input range zero and full scale temperature or resistance e Set the output range zero and full scale usually 4mA and 20mA e Last after making changes calibrate your settings for zero gain excitation and linearization by clicking Start Calibration and follow the on screen prompts Use these controls to configure the channel then calibrate your I O selection You must calibrate any changes you make in this section by clicking Start Calibration after making your selections 12 http www acromag com Model TT231 0600 Quick Overview HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and then click to point to a field or control to get a Help message pertaining to the item you pointed to For detailed configuration and calibration procedures see the Operation Step By Step section of the Technical Reference on page 14 of this manual Acromag Inc Tel 248 295 0880 Two Wire RTD Transmitter w USB The Configuration Calibration section includes a type field where you are prompted to enter measured current values for zero and full scale after starting calibration You can also read the current transmitter configuration with Get Config or Abort calibration if necessary Under Over Scale Thresholds Sets Output Range
15. or Linear Resistance input support e Adjustable input range with spans up to 850 C 1562 F or 9000 e Adjustable input excitation linearization and output range e Fully analog signal path input signal is not digitized e Digitally setup and calibrated wi Windows software via USB e Thin 12 5mm wide enclosure for high density DIN rail mounting e Converts sensor signal with a single differential measurement e Very fast output response e Supports Degrees Celsius or Fahrenheit Temperature Ranges e Extra output connections support Sink or Source output wiring e Connects to two three or four wire sensors e Lead wire compensation 3 wire e Up or down scale lead break burnout detection e Adjustable output error alarm levels outside of operating range e Convenient non polarized two wire current loop powered e Provides a linearized or non linearized output response e Adjustable under range and over range levels Namur compliant e High measurement accuracy and linearity e Wide ambient temperature operation e Hardened For Harsh Environments e CE Approved e UL cUL Class 1 Division 2 Approved This transmitter is designed for high density mounting on T type DIN rails Its non isolated input is intended to mate with non grounded 100Q Pt RTD temperature sensors or resistive elements It provides an output current linearized to the RTD sensor temperature Optionally it can support simple resistance input and drive an
16. output terminals have a floating connection relative to earth ground Earth ground is normally applied at the output loop power minus terminal and in common with the loop load or loop receiver minus e Do not earth ground any input lead and use only insulated non grounded RTD sensors This transmitter does not isolate its input signal e Respect the traditional position of earth ground in a two wire current loop and avoid inadvertent connections to earth ground at other points which would drive ground loops and negatively affect operation This includes a USB connection to the transmitter which should be made via a USB isolator as most Personal Computers earth ground their USB ports and this makes contact with both the USB signal and shield grounds Acromag Inc Tel 248 295 0880 10 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB USB Connections This transmitter is setup configured amp calibrated via configuration software that runs on a Windows based PC connected to the unit via USB Windows XP or later required Refer to the following drawing to connect your PC or laptop to the transmitter for the purpose of reconfiguration and calibration using this software TT SERIES USB TRANSMITTER CONNECTIONS USED FOR CONFIGURATION AND CALIBRATION OF THE TRANSMITTER IN A SAFE OR ORDINARY LOCATION
17. purpose Further Acromag assumes no responsibility for any errors that may appear in this manual and makes no commitment to update or keep current the information contained in this manual No part of this manual may be copied or reproduced in any form without the prior written consent of Acromag Inc Acromag Inc Tel 248 295 0880 3 http www acromag com Model TT231 0600 GETTING STARTED DESCRIPTION Symbols on equipment A Means Refer to User s Manual this manual for additional information Key Features Application For additional information on these devices and related topics please visit our web site at www acromag com and download our whitepaper 8500 904 Introduction to Two Wire Transmitters Also see 8500 917 The Basics of Temperature Measurement Using RTD s Two Wire RTD Transmitter w USB The TT231 0600 is an ANSI ISA Type II transmitter designed to interface with a Platinum RTD sensor Resistance Temperature Detector or resistance input and modulate a 4 20mA current signal for a two wire current loop This unit is setup and calibrated using configuration software and a USB connection to Windows based PC s Windows XP and later versions only The unit provides RTD sensor excitation linearization lead wire compensation and lead break or sensor burnout detection It also offers an adjustable input and output range with degrees F or C selection and adjustable loop alarm levels e Pt RTD
18. www acromag com Model TT231 0600 Output Power Connections Two Wire RTD Transmitter w USB This transmitter has an ANSI ISA Type 2 output in which the unit s power and output signal share the same two leads and the transmitter output has a floating connection with respect to earth ground Connect a DC power supply and load in series in the two wire loop as shown in drawing below Output connections are not polarized The output and designations are for reference only with current normally input to Output and returned via Output current sinking Loop supply voltage should be from 9 32V DC with the minimum voltage level adjusted to supply over range current to the load plus 9V minimum across the transmitter plus any transmission line drop Variations in power supply voltage between the minimum required and 32V maximum has negligible effect on transmitter accuracy Variations in load resistance has negligible effect on output accuracy as long as the loop supply voltage is set accordingly Note the traditional placement of earth ground in the current loop The transmitter output floats off this ground by the voltage drop in the load resistance and lead wire This is very important when making USB Connections and will drive the need for USB isolation see USB Connections section Always connect the output power wires and apply loop power before connecting the unit to USB MODEL TT231 0600 OUTPUT POWER WIRING TRADITIONAL LO
19. ANSMITTER 1 THIS NON ISOLATED RTD RESISTANCE TRANSMITTER IS INTENDED FOR UN GROUNDED RTD PROBES How It Works Key Points of Operation Signal Path is Analog Unit is Loop Powered Input is Non lsolated Conversion is Differential Configuration is Digital Calibration is Digital Converts RTD with a Single Differential Measurement Output Power Terminals are Not Polarized Only Leads must be balanced for lead compensation Acromag Inc Tel 248 295 0880 This digitally calibrated analog transmitter uses a unique low noise voltage to current conversion scheme that delivers equivalent 12 bit performance but does not actually digitize the input signal Instead it uses integrated Digital to Analog Converters DAC to adjust the zero offset control the excitation currents and drive linearization correction to the input These DAC s work together to achieve nearly 12 bits of adjustment resolution but do not operate directly on the analog input signal itself Likewise there are no microcontrollers in the I O signal path of this design and no embedded firmware relative to processing the signal Transmitter functionality is actually hard wired integrated into an application specific component IC The only microcontroller in this design is used to convert the external USB signals to an internal SPI bus signal during reconfiguration Windows configuration software is used to write configuration parameters into non v
20. Acromag i THE LEADER IN INDUSTRIAL LO USB Programmable DIN Rail Mount Thin Temperature Transmitter Model TT231 0600 RTD Input Two Wire Transmitter USER S MANUAL ACROMAG INCORPORATED Tel 248 295 0880 30765 South Wixom Road Fax 248 624 9234 Wixom MI 48393 7037 U S A email sales acromag com Copyright 2012 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 935C Model TT231 0600 Two Wire RTD Transmitter w USB Table of Contents GETTING STARTED DOE SCRIP TIN eege E 4 KEY FOALUPCS cis ssesiveeisnsesessssuceduvessesuvsenueedssensedudcesausdeweseusesuesvienssivessivesae suas deuesbasecdeeSeussoussennsese 4 PD PN CARON WE 4 Mechanical Dimensions scssssssssnzexsanaisaviovenndnnexensavnacenvacanenaxanxnpiaptareanenienioxcosenuxaueesiovenuanmnaieacte 5 DIN Rail Mounting amp Removal ssssssssssssssssssssscossssocsssssesssesscossssoosesscesssesesesesecssessoosssseessses 5 ELECTRICAL CONNECTIONS ssssssssnsnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnne 6 Sensor Input CONNECTIONS wwsccciecsiedecscseecendeveticveveesvcvecereceuceesverdcsevscvedsecnsdecesavevesveevenseoscveverses 7 Output Power e E TT 8 Earth Ground Connections svsosicnsiavexsvsasiacencanencnacsioscnnsnnakerienioseoueanexcuassiolavadupenconmxiovendaiwananies 10 e E d accsrsevicesouiticevtesaviis de canainigeenteeaenntwaeanensweea ea daos Eanes aes aE as ES ase iaie 11 CONFIGURATION SOFTWARE
21. Connect Device Status Device Name s Product Name Manufacturer Serial Unit Status Fault Status Sensor Fault Break Detection Direction Value URY 0 4mA ORY 1 0ma Factory Settings Acromag 71231 Configuration Software Device Connect Device Status Device Name s l v Product Name TT231 0600 000004A Manufacturer Acromag Inc Serial 0000044 Unit Status Fault Status No Faults Read Status Reset Unit Sensor Fault Break Detection Direction O Downscale Value URY 0 4mA Submit Break Detection Factory Settings Restore Factory Settings Read Complete Upscale ORY 1 0mA 15 lt Configuration Calibration Input Type Sensor Wiring Alpha Value Temperature Units Input Zero Input Full Scale Input Temperature S Range c C Current Output Output Zero Output Full Scale Range TA m Measured Current m Output Get Config Under Over Scale Thresholds Under Range Value URV 0 00 ma 0 00 C Min ma Over Range Value ORV 0 00 m 0 00 C Min Configuration Calibration Input Type Platinum RTD O Two Wire CH Resistance Sensor Wiring Three Four Wire Alpha Value PT385 el Celsius O Fahrenheit Input Zero Input Full Scale Input Temperature 0 v oc 200 00 o Range Output Full Scale ma 20 000 m Temperature Units Current Output E Range 4 000 Measured Curre
22. LOT INPUT SIDE FOR REMOVAL FROM T TYPE DIN RAIL LE SCREWDRIVER TO REMOVE MODULE FROM RAIL AS SHOWN ELECTRICAL CONNECTIONS A WARNING EXPLOSION HAZARD Do not disconnect equipment unless power has been removed or the area is known to be non hazardous WARNING EXPLOSION HAZARD Substitution of any components may impair suitability for Class I Division 2 WARNING EXPLOSION HAZARD The area must be known to be non hazardous before servicing replacing the unit and before installing Wire terminals can accommodate 14 26 AWG solid or stranded wire Input wiring may be shielded or unshielded type Ideally output wires should be twisted pair Terminals are pluggable and can be removed from their sockets by prying outward from the top with a screwdriver blade Strip back wire insulation 0 25 inch on each lead and insert the wire ends into the cage clamp connector of the terminal block Use a screwdriver to tighten the screw by turning it in a clockwise direction to secure the wire 0 5 0 6Nm torque Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed As a rule output wires are normally separated from input wiring for safety as well as for low noise pickup Acromag Inc Tel 248 295 0880 6 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Sensor Input Connections Sensor wires are wired directly to tra
23. OP POWERED SINKING OUTPUT CONNECTIONS INPUT SIDE A O O X MODEL TT231 0600 XE TOP VIEW TPUT SIDE SCHEER OUTPUT SIDE en THIS TRANSMITTER IS CURRENT LOOP POWERED DCH TBS Je aS L 4 20ma SHIELDED e Uc Z TWISTED PAIR UPPER LEVEL F 4 l DC SUPPLY oer wy vc 9 32V TB4 aa SR E F 7 Doan EARTH OPT C TERMINALS GROUND ARE COMMON SEE OPT TB4 WIRING NOTE OUTPUT TERMINALS ARE NOT POLARIZED AND PLUS amp MINUS LABELS ARE FOR REFERENCE ONLY OPTIONAL WIRING TERMINALS C ARE HELD IN COMMON AND USED FOR SOURCING LOOP WIRING A SEE OPTIONAL OUTPUT WIRING DIAGRAM The traditional loop powered sinking output connections are shown above Shielded twisted pair wiring is often used at the output to connect the longest distance between the field transmitter and the remote receiver as shown The output of this transmitter fluctuates relative to earth ground by the voltage drop in the load and connection wire This makes it flexible in the way it connects to various Receiver devices Acromag Inc Tel 248 295 0880 8 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Outp ut Power In most installations the loop power supply will be local to either the transmitter or local to th
24. Platinum RTD types use the scroll bar to select your Input Zero temperature 50 C 0 C or 0 F Zero is a fixed value for Pt RTD For Resistance Input Type you instead enter an Input Zero value in ohms OO typical for a 0 5000 range or 1000 typical for a 100 2000 range If you choose 00 as your input zero then your under scale threshold selection set in a later step cannot be achieved except for the purpose of indirectly setting the downscale alarm limit which is O 4mA below your under scale threshold setting Note that when setting your range some under range is built in later via the Under scale Threshold selection set separately see below Note that this selection indirectly determines the PGA minus lead connection from the input multiplexer Different paths are chosen which have different pedestal resistors installed that happen to be set just below the corresponding resistance of the platinum input sensor at its zero temperature For example the Resistance Input Type will use the 0 C pedestal resistor which is 98 8Q An equivalent sensor input resistance actually drives the differential signal measurement to OV Next enter your Input Full Scale temperature Pt RTD Input or full scale resistance Resistance Input Type Your Input Full Scale selection will correspond to 100 of output For Pt RTD you can enter any value up to 850 C For the Resistance input type you can enter any resistance value up to 900Q Note that the
25. SB cable to the transmitter Communication or power was interrupted while USB was connected and the configuration software was running Close the current connection with the software re scan the transmitter then select and re open the transmitter for communication or simply exit the configuration software and reboot it Output Erratic Not operational or at Wrong Value Missing USB isolation If your two wire output loop is grounded then connecting USB to the transmitter will drive a ground loop between your current loop and earth ground at the PC Always use USB signal isolation or alternatively you can connect directly to a battery powered laptop which does not earth ground its USB connection Otherwise Verify loop power and voltage level Try Closing the connection and re opening it Output goes to Over Range Value ORV or Under Range Value URV This indicates that the input signal is out of range If the level is 1mA above the ORV or 0 4mA below URV then this would indicate a sensor fault or lead break Cannot Communicate with Transm A missing USB Isolator could cause a ground loop when connecting to USB from a Personal Computer Check your input signal with respect to your calibrated range and reduce or increase it as required to drive your output current within its linear operating range Also check the wiring of your input sensor itter via USB A ground loop is created betw
26. TD Input only After clicking Go to Step 3 the following message will be displayed T7231 Config d Step 3 Linearization Calibration Please set your input to 175 86 Measure the corresponding output current and enter the measured value into the Measured Output Current field Step 3 reads just like Step 2 except the RTD linearization circuit has been activated and your output signal shifts closer to your desired full scale output level Click OK and this message is repeated in the prompt window at the bottom of the screen The transmitter needs your output reading with linearization enabled to adjust the RTD linearization correction current for the sensor excitation You don t need to readjust your input signal at this step as it uses the same full scale input from the prior step 2 Simply measure your output signal and input the new measurement taken note that it will be closer to the full scale output than it was in step 2 as linearization is ON Type the measured output current in milliamps into the Measured Current Output field Then click the Complete Calibration button and the following message will appear your output may shift slightly to reflect an adjustment to linearization 17231 Config At this point the transmitter is calibrated Click OK to continue Check the accuracy of a few other points A Calibration Complete j r S r Note that if your input type is Pt RTD your output will be linear with the inp
27. The opposite rounded edge at the bottom of the output side allows you to tilt the unit upward to lift it from the rail while prying the spring clip back with a screwdriver To attach the module to T type DIN rail angle the top of the unit towards the rail and place the top groove of the module over the upper lip of the DIN rail Firmly push the unit downward towards the rail until it snaps into place To remove it from the DIN rail first separate the input terminal blocks from the bottom side of the module to create a clearance to the DIN mounting area You can use a screwdriver to pry the pluggable terminals out of their sockets Next while holding the module in place from above insert a screwdriver into the lower path of the bottom of the module to the DIN rail clip and use it as a lever to force the DIN rail spring clip down while pulling the bottom of the module outward until it disengages from the rail Then simply lift it from the rail http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB TT2XX MODULE DIN RAIL MOUNTING AND REMOVAL TILT MODULE UPWARD TOWARDS RAIL AND HOOK ONTO UPPER LIP OF RAIL ROTATE MODULE DOWNWARD TO ENGAGE SPRING CLIP ONTO LOWER OUTPUT SIDE LIP OF RAIL TOP Aa mn l N 35mm DIN Rail C C C TT2XX MODULE T Rail SPRING CLIP e BOTTOM SCREWDRIVER S
28. a rare error that is not likely to occur but if persistent it may indicate a unit defect You can reset the transmitter or simply cycle power to clear it If it continues to occur then you should try restoring factory calibration If the error still occurs you should consult with the factory and arrange for the unit to be returned for repair or replacement http www acromag com Model TT231 0600 Diagnostics Table Acromag Inc Tel 248 295 0880 Two Wire RTD Transmitter w USB Unit fails to operate or has an erratic output signal Is input grounded This non isolated model is intended for use with ungrounded RTD probes A grounded probe could inadvertently short the input bias voltage causing erroneous operation in particular if the output loop is already grounded Unit drives a low current but fails to drive current at near above 20mA Loop supply voltage is too low to support full scale or over range current into the loop load Check power supply voltage and make sure it is gt 9 0 020 Rload If the transmission distance is long it must additionally support the IR drop in the wire Ideally the voltage should have ample overhead to drive the load at the maximum output current 1mA above the Over Range Value that you set Cannot Calibrate Input Channel Is input wired properly Check input wires at terminals 1 3 amp 4 Missing third input terminal connection You may have d
29. ally adjustable via Coarse and Fine DAC s with 256 steps of adjustment for each 7bits sign bit Coarse adjust is 195 to 195uA w 1 54uA step Fine adjust is 12 2 to 12 2 uA with 96nA step Also adjusted via linearization feedback for Pt RTD input types Input Lead Wire Compensation Requires balanced sensor leads same size length amp type and only used with 3 or 4 wire sensor connections Recommended maximum lead resistance is 25Q per lead Input Lead Resistance Effect Shift less than 0 01 per ohm of lead resistance with a max shift less than 0 1 with up to 100 per lead Lead Break Sensor Burnout Detection Select output upscale or downscale detection Alarm output level is indirectly programmed via the linear U O threshold settings see Output Fault Limits Input Bias Current 50pA typical PGA doubling every 10 C Acromag Inc Tel 248 295 0880 36 http www acromag com Model TT231 0600 Output Two Wire RTD Transmitter w USB Output Range 4 to 20mA DC nominal digitally adjustable The full linear operating range is a function of zero 3 5mA to 6mA and full scale 16mA to 24mA adjustment plus under range 2 1 to 3 6mA typical and over range 20 5 to 30mA typical threshold selection Output Accuracy Refer to Table 1 for relative accuracy referred to the input Accuracy includes the effects of repeatability terminal point conformity and linearization but does not include sensor error Outpu
30. amaged the input PGA via a ground loop or incorrect wiring You must include a wire to terminal 4 of the transmitter either from the sensor itself 3 wire sensor connection or a small jumper wire between terminals 3 amp 4 at the transmitter 2 wire connection If you cannot get the output signal to vary for a continuously variable input your input signal is within range and you have properly wired the input including input terminal 4 then your input amplifier may have been damaged and the unit will need to be replaced Does not Operate or calibrate properly with a 2 wire input connection Are you missing the jumper required between input terminals 3 and 4 Check input wiring and make sure terminals 3 amp 4 are jumpered together for 2 wire sensors The third lead from the sensor or the jumper between input terminals 3 amp 4 forms the return path of the sensor excitation current and must be present to operate the unit Output shifts momentarily while using Read Status or Get Config Reading Writing the EEPROM memory momentarily consumes more current and this is evident by amomentary glitch above 4mA in output current during reconfiguration 32 Memory is powered by the loop supply This is normal during reconfiguration via USB using the configuration software and reflects increased current draw during memory write The contents of memory is uploaded at power up and repeated access of memory is onl
31. ance e Ifyou select Platinum RTD your output will be linear with respect to sensor temperature not resistance and you will additionally have to use the Alpha Value scroll window to select your particular RTD curve type alpha is only used by the software to recommend resistance values during calibration e If you select Resistance your output current will be linear with respect to sensor resistance not temperature and no special linearization will be performed Acromag Inc Tel 248 295 0880 16 http www acromag com Model TT231 0600 Configuration HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and click to point to a field or control to get a Help message pertaining to the item you pointed to Two Wire RTD Transmitter w USB Select the Sensor Wiring This selection tells the unit which inputs to connect to its internal PGA and which inputs to connect its excitation sources to e Ifyou select Two Wire your input measurement will not be compensated for the sensor lead resistance and your input range zero will be fixed at 0 C Pt RTD Sensor leads less than a few feet long will have negligible resistance minimizing the importance of lead wire compensation in these applications e If you select Three Wire your input measurement will be compensated for its lead wir
32. azardous environments particularly for output currents near 30mA e Use the Under Range Limit slide control to select an approximate under scale threshold You have 8 levels of under scale threshold adjustment between Min amp Max typically between 2 1mA and 3 6mA Your selection will be indicated in the field just above the control e Use the Over Range Limit slide control to select an approximate over scale threshold You have 16 levels of over scale threshold adjustment between Min amp Max typically between 21mA and 30mA Your selection will be indicated in the field just above the control After making your adjustments click the Submit O U Configuration button to write your adjustments to non volatile EEPROM memory The linear operating range of your output is now defined between the limits you specified Your under scale and over scale thresholds indirectly correspond to a linear operating reqion that usually extends outside of the input zero and full scale limits you specified Additionally the sensor fault break detent output levels are set outside the linear operating region so that you can discern them from simply an over range or under range input signal You should check your under scale and over scale threshold levels For example you could disconnect an RTD lead to check your O U alarm limits which should be 0 4mA below the under scale threshold for a downscale break or 1mA above your over scale threshold for an ups
33. cale break 23 http www acromag com Model TT231 0600 Break Detection Read Status Two Wire RTD Transmitter w USB Select Upscale or Downscale Lead Break Detection Upon sensor burnout or a broken sensor lead you can select Downscale to send the output current to the under scale alarm limit which is 0 4mA less than the under scale threshold Otherwise you can select Upscale to send the output to the over scale alarm limit which is 1mA above the over scale threshold By using alarm levels outside of a defined linear operating range a lead break or open sensor can be easily discerned from an over range or under range input signal by noting its current level Optional Read Status amp Reset Unit You can use the Read Status button to display fault status information relative to the input signal The fault status error level will be indicated in the Fault Status message field and any additional diagnostic information will be displayed in the message window at the bottom of the screen Possible fault status levels and diagnostic messages are indicated below FLT LEVEL FAULT INDICATION 0 or None Normal Operation No Faults IN Exceeds Positive Limit IN Exceeds Negative Limit IN Exceeds Positive Limit IN Exceeds Negative Limit IN Exceeds Positive Limit amp IN Exceeds Positive Limit IN Exceeds Positive Limit amp IN Exceeds Negative Limit IN Exceeds Negative Li
34. ce your full scale endpoint The software used your input type and alpha information to compute the equivalent RTD resistance of the input full scale value you specified and returned that value in this prompt Click OK and this message is repeated in the system message window at the bottom of the screen You need to adjust your input signal to the full scale input value noted Measure the corresponding output current accurately and type the measured output current in milliamps into the Measured Current Output field Then click the Go To Step 3 button only Pt RTD inputs will require a 3 step Note that at this point your output signal will not be an accurate full scale output RTD Input as linearization is OFF and calibration has not been completed The second step only sets the gain of the PGA amplifier to drive the full scale output but without RTD linearization turned on If your Input Type is Resistance your calibration is complete after this step because no special linearization correction applies your output is already linear with resistance You simply need to click the Complete Calibration button to continue and your resistance transmitter should be calibrated 20 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Zero Full Scale amp Zero Full Scale amp Linearizer Calibration Procedure continued Linearizer Calibration Procedure Acromag Inc Tel 248 295 0880 3 Pt R
35. cromag Inc Tel 248 295 0880 38 http www acromag com Model TT231 0600 USB Interface Enclosure amp Physical Environmental Two Wire RTD Transmitter w USB IMPORTANT USB Isolation is recommended The transmitter circuit ground is connected in common to USB power signal ground and shield ground It will make connection to earth ground when directly connected to the USB port of a Personal Computer without the use of an isolator Failure to connect without isolation would force a potential difference between earth ground at the PC and the earth ground normally applied in a properly grounded two wire current loop This drives an inadvertent ground loop that can interfere with operation and could damage the unit For this reason USB isolation is strongly recommended when connecting to a PC Otherwise in the absence of USB isolation a battery powered laptop could be used to connect to the unit as the laptop does not normally connect to earth ground General purpose plastic enclosure for mounting on 35mm T type DIN rail Dimensions Width 12 5mm 0 5 inches Length 114 5mm 4 51 inches Depth 99 0mm 3 90 inches Refer to Mechanical Dimensions drawing 1 O Connectors Removable plug in type terminal blocks rated for 12A 250V AWG 26 12 stranded or solid copper wire Program Connector USB Mini B type 5 pin See USB Interface Case Material Self extinguishing polyamide UL94 V O rated color light gray Gene
36. cular curve at the temperatures noted Note Alpha a is used to identify the RTD curve and its value is derived by dividing the sensor resistance at 100 TC boiling point of water minus the sensor resistance at 02C freezing point of water by the sensor resistance at OC then by 100 a R100 Rov Rox 100 C For Pt 100 2 this is 38 522 100 0 2 100 C or 0 00385 7 Q and represents the average change in resistance per 2C Select the Temperature Units Pt RTD Only For your input range select the temperature units in degrees Celsius or degrees Fahrenheit Note that input ranges specified in degrees Fahrenheit will have a fixed input range zero of 0 F Units in C can chose an input range zero of 50 C or 0 C Acromag Inc Tel 248 295 0880 17 http www acromag com Model TT231 0600 Configuration HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and click to point to a field or control to get a Help message pertaining to the item you pointed to Two Wire RTD Transmitter w USB Select the Input Range Zero and Input Range Full Scale Next you need to select the input temperature range for the Pt RTD Input Type or your input resistance range for the Resistance Input Type Your selection of Input Zero is the RTD temperature or input resistance that will correspond to 0 of output For
37. d Acromag Inc Tel 248 295 0880 29 http www acromag com Model TT231 0600 TROUBLESHOOTING Diagnostics Table Before attempting repair or replacement be sure that all installation and configuration procedures have been followed and that the unit is wired properly Verify that power is applied to the loop and that your loop power supply voltage is sufficient to supply over scale current into the load MIN 0 020 Rload plus 9V at the unit terminals plus any line drop If your problem still exists after checking your wiring and reviewing this information or if other evidence points to another problem with the unit an effective and convenient fault diagnosis method is to exchange the questionable unit with a known good unit Acromag s Application Engineers can provide further technical assistance if required Repair services are also available from Acromag Acromag Inc Tel 248 295 0880 POSSIBLE CAUSE Software Fails to Scan Transmitter Bad USB Connection Two Wire RTD Transmitter w USB POSSIBLE FIX Recheck USB Cable Connection Loop power was enabled after connecting to USB You must enable the loop power supply before connecting to USB With loop power present disconnect then reconnect the USB cable to the transmitter USB has not enumerated the device Use the reset button on the Acromag USB isolator to trigger renumeration of the transmitter or simply unplug replug the U
38. ded current loop A software CDROM is included that contains the Windows software used to program the transmitter USB Isolator Order USB ISOLATOR e USB Signal Isolator USB A B Cable 4001 112 e Instructions 8500 900 This kit contains a USB isolator and a 1M USB A B cable for connection to a PC This isolator and cable are also included in TTC SIP see above USB A B Cable Order 4001 112 USB A B Cable 4001 112 This is a 1 meter USB A B replacement cable for connection between your PC and the USB isolator It is normally included with the TTC SIP Software Interface Package and also with the isolator model USB ISOLATOR USB A mini B Cable Order 4001 113 e USB A mini B Cable 4001 113 This is a 1 meter USB A miniB replacement cable for connection between the USB isolator and the TT230 transmitter It is normally included in TTC SIP Note that software for all TT Series models is available free of charge online at www acromag com Acromag Inc Tel 248 295 0880 34 http www acromag com Model TT231 0600 SPECIFICATIONS Model Number Model TT231 0600 Signal Transmitter Non lsolated RTD Input Two Wire Loop Powered CE Approved Includes UL cUL Class 1 Division 2 approvals Custom calibration to your specifications can be added as a separate line item at time of purchase Input Acromag Inc Tel 248 295 0880 Two Wire RTD Transmitter w USB The TT231 model prefix denotes a non isolated RTD
39. ds Positive Limit A missing jumper between terminals 3 amp 4 of the transmitter will return Fault Code 5 Positive Input exceeds positive Limit and Negative Input exceeds Positive Limit The following table summarizes the Fault Levels returned for a break or open in each of the input leads LEAD BREAK 2 WIRE FAULT 3 WIRE FAULT 4 WIRE FAULT 1 M Not Flagged 2 IN 3 IN 4 L 3 4 Jumper You can use Reset Unit to reset the transmitter and cause it to revert to its power up or last saved configuration This will also clear a very rare checksum error which can occur if the transmitter fails to read its configuration from the EEPROM properly or if the EEPROM contents have been corrupted A checksum error will also send the output current to 0 4mA below the lowest under scale threshold setting until reset via this control or by toggling loop power OFF ON A persistent checksum error could indicate a defective transmitter Optional Factory Settings You can use the Restore Factory Settings button to restore the transmitter configuration to the original factory state see Specifications Reference Test Conditions including the optional settings over under scale amp and break detection This control provides a potential recovery path should the configuration ever become corrupted during recalibration perhaps due to miscalibration For example if during calibration you break the USB
40. e of these terminals in your wiring scheme allows you to connect external power local to the transmitter and form a sourcing entity from this sinking output as shown LOCAL 24VDC MODEL TT231 0600 OPTIONAL OUTPUT WIRING POWER SUPPLY OPTIONAL SOURCING OUTPUT CONNECTIONS WITH x L POWER LOCAL TO TRANSMITTER 24VDC a TOP VIEW INPUT SIDE OUTPUT SIDE OUTPUT SIDE TN TB3 Sao REMOTE RECEIVER LOAD 1B3 2 OUTPUT IK LOOP 4 TERMINALS FS EECH l gt 6 OOP L WW TWISTED PAIR aa ae l L kasel Rab MODEL TT231 0600 TB4 Cc C 4 e common IK O TERMINALS YY Vv C LG l OPTIONAL COMMON CONNECTIONS WITH LOCAL EXTERNAL 3 WIRE POWER FORM A A SOURCING OUTPUT RELATIVE TO THE REMOTE SINKING LOAD Earth Ground Connections The unit housing is plastic and does not require an earth ground connection If the transmitter is mounted in a metal housing a ground wire connection is typically required and you should connect that metal enclosure s ground terminal green screw to earth ground using suitable wire per applicable codes See the Electrical Connections Drawing for Output Power and note the traditional position of earth ground for the two wire output current loop The Type Il transmitter
41. e remote receiver Common receiver devices include the input channel Connections of a Programmable Logic Controller PLC a Distributed Control System DCS or a panel meter Some receivers already provide excitation for the transmitter loop and these are referred to as sourcing inputs Other receivers that do not provide the excitation are referred to as sinking inputs and these will require that a separate power supply connect within the loop These types of receivers are depicted below MODEL TT231 0600 OUTPUT WIRING SINKING OUTPUT CONNECTIONS WITH COMMON TWO WIRE TRANSMITTER CONNECTION TO SOURCING AND SINKING INPUT RECEIVERS POWER LOCAL TO THE RECEIVER Two Wire Output Connections to the Input Card of a Distributed Control System or Programmable Logic Controller TOP VIEW INPUT SIDE OUTPUT SIDE OUTPUT SIDE 24VDC POWER SUPPLY lt 1 2 DCS PLC SOURCING 24VDC TB3 SS INPUT CARD S ZS Steier P 24VDC OUTPUT F ae TWISTED PAIR DCS PLC SINKING TERMINALS S Loop Eco OR occo INPUT CARD Se i Lent MODEL TT231 0600 TB4 Z RCV COMMON RCV TERMINALS zZ SZ SOURCING INPUT RECEIVER SINKING INPUT RECEIVER The 24V DC Excitation is The 24V DC Excitation is Provided Provided by the Card by a Separate Power Supply A N WARNING For compliance t
42. e resistance as long as the input leads are of the same length size and type Additionally you will be able to select an input zero of 50 C 0 C or O F input zero is a fixed selection of 3 different values while the full scale is programmable to any value in range If you have a four wire sensor select Three Wire A selection of Two Wire requires that you additionally wire input terminals 3 amp 4 together with a short copper jumper wire A selection of Three Wire requires that a third lead be wired to input terminal 4 and the other end of this lead connects to the minus terminal at the sensor In both cases this third wire connection serves as the return path for the excitation current and it must be present in either form in order to make your measurement If you have actually wired a four wire sensor it will use 3 wire lead compensation Select the Alpha Value Pt RTD Only for internal use only For the Pt RTD Input Type you should specify the Alpha Value of your particular RTD curve The software only uses this information to compute the input resistances required to calibrate your selected input range for Platinum RTD Input Types which it then returns in message prompts during the calibration process If you are calibrating to a particular curve not indicated you may select this value arbitrarily and just substitute your own resistance values during calibration that will correspond to your parti
43. een a normally grounded two wire current loop and earth ground of the PC USB port Only connect to USB via a USB isolator Otherwise use a battery powered laptop to configure the transmitter 30s http www acromag com Model TT231 0600 Diagnostics Table Acromag Inc Tel 248 295 0880 Two Wire RTD Transmitter w USB POSSIBLE CAUSE POSSIBLE FIX Cannot Communicate with Transmitter via USB Loop power ON to the unit Unit requires a loop power connection even when connected to USB The loop power supply should also be present before connecting to USB Output goes 1mA above the selected Over Range Value ORV This is the Upscale alarm level and indicates the input signal exceeds the common mode range of the input This can also occur if the third sensor wire is missing 3 4 wire RTD a lead has broken the sensor has burned out or is open or the jumper between terminals 3 amp 4 of the transmitter is not installed 2 wire RTD An Upscale alarm is normally driven by a sensor fault open sensor or broken lead with lead break detection set upscale It can also be triggered by a very high sensor resistance that looks open to the transmitter Check sensor resistance sensor connections and your connection to input terminal 4 to restore input operation You can check your sensor connections by measuring a voltage drop across your input resistance equal to 0 5mA Sense _Ohms If connections are OK
44. esistanceut 02 freezing point of water by the DL 10000 J0000 k sensor resistance at 02C then by 1008 r R1008C ROC RORC 1008C For Pt 1000 this is 38 50 100 00 100 C or 115 54 115 78 0 003850 0 2C 119 40 119 70 The configuration software wil allow you to select the curv required for your application e your alpha value tt uses this value to calculate the corresponding input resistance required during EE in calibration prompt messages 500 280 98 283 84 375 70 380 10 390 48 395 12 Note Shaded values fall outside the supported zero range for the TT231 Acromag Inc Tel 248 295 0880 22 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Over Scale amp Under Scale Thresholds TIP Namur Limits For Namur compliant output limits you generally need to produce a linear output range from 3 8mA to 20 5mA and have a failure high limit greater than or equal to 22 5mA and a failure low limit less than or equal to 3 6mA TIP Error Detection Note that a checksum error can be distinguished at the output signal from a lead break error by selecting an under scale limit that is greater than the minimum threshold setting This is because a checksum error always sends the output signal to a level that is 0 4mA below the lowest threshold setting until reset 1 8mA If you select an under scale threshold value greater than the minimum then you ensure that the dow
45. f the IR voltage drop produced in this resistor recommended In any case be sure to power the loop with a voltage that minimally must be greater than the 9V required by the transmitter plus the IR drop of the wiring and terminals plus the IR drop in the load To compute the IR drop be sure to use a current level that considers the over scale current and alarm limit by adding 1mA to the over scale threshold that you select this could be as high as 30mA depending on your selection of over scale threshold Loop Power Supply Voltage Make sure your voltage level is at least 9V plus 0 020 load_resistance Ideally it should be great enough to drive the over range alarm current into your load i e up to 9V 0 030 Rload assuming line drop is negligible and the maximum possible over range threshold is configured The non volatile memory of the transmitter receives its power from the loop supply not USB Therefore apply power to the transmitter output loop and always power the loop before connecting to USB 3 Connect to PC via USB Refer to USB Connections of page 11 and connect the Acromag Inc Tel 248 295 0880 transmitter to the PC using the USB isolator and cables provided in Configuration Kit TTC SIP Now that you have made your connections and applied power you can execute the TT231Config exe software to begin configuration of your unit software is compatible with XP or later versions of the Windows operating system 14 ht
46. for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and click to point to a field or control to get a Help message pertaining to the item you pointed to Two Wire RTD Transmitter w USB The actual operating range limits of your input sensor will depend on the linear output operating range defined by the output under scale and over scale threshold limit settings set separately below Threshold limiting allows you to define an under scale threshold typically between 2 1mA and 3 6mA and an over scale threshold between 21mA and 30mA This indirectly corresponds to a linear operating range outside of the input zero and full scale limits It also indirectly defines the fault current levels which will be O 4mA below the under scale threshold for down scale detection and 1 0mA above the over scale threshold for upscale detection The Min Max range of adjustment has already been calibrated at the factory and the Min Max values indicated will vary between units Note that the range of adjustment for the threshold levels can vary as much as 10 of span between units for the same digital setting Calibrate I O Range Selection CAUTION RTD Input levels outside of the nominal input range of the unit 50 to 850 C or 0 9000 will not be accepted for configuration of zero or full scale Since not all input levels can be validated during field programming
47. he same type and length their individual contributions to the differential signal cancel out as equal IR drops in each lead and the precise voltage across the RTD element is measured directly proportional to its sensed temperature Connecting without this third lead causes the sensor excitation current to return via the minus lead then combining with the minus lead current in the small jumper placed between terminals 3 amp 4 of the transmitter for a 2 wire sensor connection This unbalances the sensor measurement preventing lead wire compensation The current returned via the third sensor lead is shunted through a common mode resistor effectively biasing the input signal above OV and into the common mode input range of the amplifier The small resistance of this line adds a small common mode voltage that increases the bias and is essentially rejected by the amplifier Note that if the sensor is connected via two wires the lead wire resistance is not compensated for Thus for two wire sensors you must a small jump wire between leads 3 amp 4 which allow the combined excitation currents to reach the common mode shunt resistor and properly bias the sensor Note that any 2 wire sensor can be made to compensate for its lead wire resistance by simply adding a third lead to the sensor in place of the jumper and for this unit that third lead can be a different size and type of material than the input leads to the sensor Acromag Inc Tel 248 295
48. imum temperature for the RTD range 50 C 0 C or O F The return current sinking through the common mode resistance drives a positive bias to the differential voltage signal that is proportional to the RTD element resistance The differential voltage measured by the transmitter is corrected slightly to make it linear with temperature by modulating the sensor excitation current with a value determined during calibration then converted to a proportional process current at its output Because the currents in each lead match and if both the positive and negative leads to the RTD are of the same length type and diameter then the IR drop in these lines will create small common mode voltages that are effectively rejected by the differential instrumentation amplifier measurement In this way the measured signal is compensated for the additional resistance of the tlead wires without making a separate measurement Refer to the block diagram to gain a better understanding of how this transmitter works A third sensor wire is used to compensate the sensor for the resistance of the lead wires which can affect the accuracy of the RTD bulb given its low initial resistance 100 ohms at 0 C typical and its small change in resistance per degree of temperature change Here the third lead wire is used as the return path for both the positive and negative sensor lead currents As long as both the positive and negative lead wires to the resistance bulb are t
49. input type of the DIN Rail Mounted Series 230 Thin Transmitter family The trailing O600 model suffix denotes 2 wire loop power with CE and UL cUL Class 1 Division 2 Approvals Optional factory calibration to your own specifications is ordered as a separate line item at time of purchase and on a per unit basis Factory calibration requires pre selection of input type Pt RTD or Resistance sensor wiring 2 wire or 3 4 wire Input Zero Value 50 C 0 C or O F for Pt RTD or Ohms for Resistance Input Full Scale up to 850 C 1562 F or 900Q and Sensor Fault Detent Upscale or Downscale You can obtain form 8500 858 for specifying this calibration from our web site at www acromag com The standard model without adding custom factory calibration is calibrated by default for Pt100 RTD a 0 00385 Q Q C 3 wire 0 C to 200 C input 4 to 20mA output and upscale fault detection Recalibration of any model will require use of an TTC SIP configuration kit ordered separately see Accessories Models can be mounted on standard T Type DIN rail Reference Test Conditions 1000 Pt RTD a 0 00385 Q O C 0 C to 200 C input Output 4 20mA Upscale break detection Ambient 25 C Power Supply 24V DC R Load 250Q Input Ranges amp Accuracy Configurable for 100Q Platinum RTD from 50 C to 850 C or for linear resistance from OO to 900Q as shown in Table 1 below Accuracy is dependent on the calibra
50. ld be four times better than the rated accuracy you are trying But before you attempt to to achieve with this transmitter reconfigure or recalibrate this transmitter please make the following electrical connections Connect Input N Connect Output Connect PC USB Configure Calibrate I O 1 Connect Input Refer to Sensor Input Connections of page 7 and connect a precision resistance decade box or RTD calibrator to the input as required Your resistance source must be adjustable over the range desired for zero and full scale A 3 wire or 4 wire sensor connection is recommended as this will compensate for sensor lead resistance this unit will use 3 wire lead compensation for 4 wire sensors Be sure to either wire a third lead to the remote sensor or install a short copper jump wire between input terminals 3 amp 4 of the transmitter as this serves as the return path for the excitation current and must be present for operation 2 Connect Output Power Refer to Output Power Connections of pages 7 9 and wire an output current loop to the transmitter as illustrated You will need to measure the output current accurately in order to calibrate the unit You could connect a current meter in series in this loop to read the loop current directly not recommended Alternatively you could simply connect a voltmeter across a series connected precision load resistor in the loop then accurately read the output current as a function o
51. lue Step 1 Zero calibration Please set your input resistance to X Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field Error Reading Module Please check your loop power Measured Output accepts positive numbers with up to 4 decimal numbers Error Output Zero must be between 3 0 and 6mA Step 2 Full scale calibration Please set your input to X Ohms Measure the corresponding output current and enter the measured value into the Measured Current Output field Measured Output Box accepts positive numbers with up to 4 decimal numbers Error Measured Output must be between 15 and 24mA Step 3 Linearization Calibration Please set your input to X Measure the corresponding output current and enter the measured value into the Measured Output Current field Calibration Complete Measured Current Output Box accepts positive numbers with up to 4 decimal numbers Error connecting to module Only model TT231 0600 is compatible with this software Reset Complete Output Span accepts positive numbers with up to 4 decimal numbers Acromag Inc Tel 248 295 0880 26 http www acromag com Model TT231 0600 BLOCK DIAGRAM Transmitter ASIC POSITIVE AND NEGATIVE INPUT Two Wire RTD Transmitter w USB TT231 0600 SIMPLIFIED SCHEMATIC FILTERING AND DETAIL OMITTED FOR CLARITY MICRO
52. mit amp IN Exceeds Positive Limit IN Exceeds Negative Limit amp IN Exceeds Negative Limit Error Reading Unit Check Connections and try again Note A two wire sensor cannot correctly register IN errors as this always requires a third sensor lead A break at IN will return Fault Level 3 the same as a break at IN If an IN error is flagged with a 2 wire sensor it refers to the short jumper wire placed between terminals 3 amp 4 of the unit which supplants the third sensor lead for 2 wire input connections Failure to install this jumper for 2 wire sensors will drive error level 5 see below Normally after clicking Read Status No Faults will be indicated and Read Complete Normal Operation inputs in range will be displayed in the message bar For a 3 wire sensor a break in the IN lead will return Fault Code 3 Positive Input Exceeds Positive Limit A break in the IN lead will return Fault Code 1 Negative Input exceeds Positive Limit A break in the third lead that connects to terminal 4 will return Fault Code 5 Positive Input exceeds positive Limit and Negative Input exceeds Positive Limit Acromag Inc Tel 248 295 0880 24 http www acromag com Model TT231 0600 Read Status Reset Unit Restore Factory Settings Two Wire RTD Transmitter w USB For a 2 wire sensor a break in the IN lead and or IN will return Fault Code 3 Positive Input Excee
53. n Software and a USB connection to your PC or laptop The configuration software can be downloaded free of charge from our web site www acromag com This software is also included ona CDROM bundled with the Configuration Kit TTC SIP see Accessories section For this model look for program TT231Config exe The software is compatible with XP or later versions of the Windows operating system The configuration software screen for this model is shown at right The configuration screen is divided into six sections as follows Device Connect Configuration amp Calibration Under Over Scale Thresholds Sensor Fault Break Detection Factory Settings Unit Status and the System Message Bar at the bottom of the screen A short description of each of these groups follows For detailed configuration and calibration procedures see the Operation Step By Step section of the Technical Reference on page 14 of this manual Acromag Inc Tel 248 295 0880 K Acromag T1231 Configuration Software Device Connect Device Status Configuration Calibration Input Type O Resistance Three Four Wire Platinum RTD CH Two Wire Device Name s TT231 0600 0000044 4 T7231 0600 0000048 Sensor Wiring Alpha Value PT385 ov Scan Product Name Celsius O Fahrenheit Input Full Scale 200 00 o Output Zero Output Full Scale 4 000 ma 20 000 m Temperature Units Input Zero Input Temperat
54. ng refer to ECN 13F005 for additional information 16 DEC 13 JEB ARP Updated MTBF Numbers Removed P O Box from address Acromag Inc Tel 248 295 0880 41 http www acromag com
55. nscale alarm level limit 0 4mA below the threshold does not overlap with the checksum error level indication Acromag Inc Tel 248 295 0880 Select The Over Under Scale Thresholds amp Alarm Levels This unit allows you to select over scale and under scale output range thresholds which determine the linear operating range of your output They also indirectly define the upscale amp downscale alarm error limits as the downscale detent will be set to a current level 0 4mA below the under scale threshold and the upscale detent will be set approximately 1 0mA above the over scale threshold In this way a lead break or open sensor fault can be easily discerned from simply an over range or under range input signal The range of adjustment for the under amp over scale thresholds is calibrated at the factory and indicated via the Min and Max value fields adjacent to the slide controls Note that the threshold levels can vary as much as 10 of span between units for the same digital setting and this will be reflected by differing values for Min and Max between units The Min Max limits of adjustment are calibrated at the factory CAUTION For a low resistance or shorted load and a high loop supply voltage excessive over range current does drive excessive power dissipation in the output pass transistor of the transmitter and will cause the unit to get warm This could be troublesome at elevated ambient temperatures and in h
56. nsmitter input terminals at the bottom of the module or the left side the spring loaded DIN clip side as shown in the connection drawing below Observe proper polarity when making input connections e Use Insulated or Non Grounded Sensors Only Input is non isolated Do not ground any input leads e Two Wire Input Sensors Require Jumper For a 2 wire sensor you must connect a short copper jumper wire between input terminals 3 and 4 at the transmitter see below Alternately if you want to compensate for sensor lead wire resistance do not include this jumper but add a third copper lead from the sensor to terminal 4 as shown in the 3 wire connection figure below e Four Wire Input Sensors Use 3 Wire Lead Compensation BOTTOM VIEW MODEL TT231 0600 INPUT SENSOR WIRING cneursipe ANPUT SIDE FRONT OUTPUT SIDE EE O PLATINUM RTD OR RESISTANCE INPUT TEI SHIELDED CABLE TERMINALS 4 WIRE a WG 3WIRE 2WIRE 5 TB1 e gt a ET Di gt G G G MODEL TT231 0600 7 IN TB2 we gt z Lecker a Et DN DO NOT GROUND INPUT LEADS INPUT IS NOT ISOLATED j OPT SHIELD GROUND ADD JUMPER 2 WIRE ONLY w DIN RAIL SPRING CLIP Q _ 7 eg DIN RAIL SPRING CLIP Acromag Inc Tel 248 295 0880 7 http
57. nt ma Output Start Calibration Under Ouer Scale Thresholds Under Range Value URV Get Config 2 26 m 21 75 C Min 2 26 m Lf Over Range Value ORV 30 34 mA 329 25 C mn Max 22 43 m E 30 34 mA Submit UJO Configuration http www acromag com Model TT231 0600 Configuration HELP You can press F1 for Help on a selected or highlighted field or control You can also click the button in the upper right hand corner of the screen and click to point to a field or control to get a Help message pertaining to the item you pointed to Two Wire RTD Transmitter w USB Note that you must already have loop power connected to the transmitter before you execute this software If you do not the software will prompt you to make this connection when you execute the software program If you later interrupt loop power while already using the software and while connected to USB you may have to re open communication with the unit If more than one transmitter is connected via USB through a USB hub the software automatically opens a connection with one of the transmitters and Read Complete is indicated in the message bar at the bottom of the screen You can discern which transmitter is open by referring to the product s unique serial number indicated next to the Product Name If your intent was to open a different hub transmitter you will have to Close the current connection and use
58. o applicable safety and performance standards the use of twisted pair output wiring is recommended Failure to adhere to sound wiring and grounding practices as instructed may compromise safety performance and possibly damage the unit TIP Ripple amp Noise Power supply ripple at 60Hz 120Hz is normally reduced at the load by the transmitter but additional filtering at the load can reduce this ripple further For large 60Hz supply ripple connect an external 1uF or larger capacitor directly across the load to reduce excessive ripple For sensitive applications with high speed acquisition at the load high frequency noise may be reduced significantly by placing a 0 1uF capacitor directly across the load as close to the load as possible TIP Inductive Loads If the two wire current loop includes a highly inductive load such as an I P current to pressure transducer this may reduce output stability In this case place a 0 1uF capacitor directly across the inductive load and this will typically cure the problem Acromag Inc Tel 248 295 0880 9 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB This model includes two extra terminal connections at TB4 marked C which Output rower provide a convenient wiring point for a sourcing wiring variation as shown Connections below Internally these two terminals are connected in common with each other and do not connect to the internal circuit Us
59. olatile EEPROM memory at setup These stored parameters are auto downloaded into the transmitter ASIC at power up and will define its normal operation Setup involves selecting the input type Pt RTD or Resistance input wiring 2 wire 3 wire 4 wire the Pt RTD alpha coefficient the input range zero 50 C 0 C or 0 F the input range full scale up to 850 C or 900Q the output range zero the output range full scale specifying the output over and under scale thresholds and alarm detents and setting upscale or down scale lead break or sensor fault detection 27 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB How It Works This transmitter uses a unique signal processing method that reduces error by l Se converting the 3 or 4 wire sensor with a single differential measurement including the lead wire compensation During operation a small excitation current is passed through the positive lead of the RTD element A matching excitation current is passed through a zero pedestal resistor Rz and into the minus lead of the sensor element These currents combine and return to the unit via a third lead that is terminated with a common mode resistance in the unit 3 wire connection The voltage drop produced in the series connected zero resistor of the minus lead has the effect of driving the differential input voltage across the bulb and in parallel with the input amplifier near OV for bulb temperatures near the min
60. ompensation or two wire w o lead compensation Input Zero Adjust For Pt RTD w 3 or 4 wire connection select 50 C 17 78 C 0 F or 0 C or for Pt RTD w 2 wire Connection input zero is fixed at 0 C For Resistance input zero is user specified in ohms as OO or 1000 typical Some zero values in ohms will not be acceptable and the software may prompt you to make adjustments Input Full Scale Adjust For Pt RTD specify a full scale temperature up to 850 C For Resistance input specify a resistance up to 9000 Minimum recommended span is 50 C RTD and 8Q Resistance Input Response Time See Output Response Time Input Filter Bandwidth 3dB at 700Hz typical normal mode filter Input Linearization Preset for input Additive to excitation current to accomplish linearization of Pt RTD inputs Correction is digitally adjustable with an 8 bit value 256 steps at 3 9nA mvV per step set to zero for linear resistance input The maximum linearization coefficient is 0 99uA mv Alref AVin Input Gain PGA gain is adjustable for 6 25 12 5 25 50 100 200 and 400 mV mvV PGA output voltage sinks current through 6 34KQ and a current gain of S0mA mA is applied to that current at the output stage Input Excitation Current Utilizes dual current sources one for each input lead matched within 0 2 Set to 0 493mA typical with less than 10ppm C drift over temperature zero code level for each is between 0 480mA and 0 510mA Digit
61. orresponding output current First it will prompt you to apply the zero input signal resistance then measure and record the corresponding zero output signal current Second it does the same for the full scale input resistance and the corresponding full scale output current signal it makes adjustments to gain at this stage but with linearization turned off Third for Pt RTD input types it enables linearization and prompts you to apply the full scale input resistance signal again and then measure and record the corresponding full scale output current it uses this second full scale measurement to adjust the magnitude of its linearization correction for the sensor There may still be combinations of zero and full scale that you will not be able to adjust and calibrate the unit for For example this might occur for very tight input spans or odd endpoints The Configuration Software will usually let you know when you need to adjust your desired limits as you enter them Acromag Inc Tel 248 295 0880 19 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Zero Full Scale amp Linearizer Calibration Procedure By default the unit is factory calibrated to a 1000 Pt385 RTD type using a 3 wire sensor connection and a 0 to 200 C input span to drive a 4mA to 20mA output span For our example below we will instead use the 0 to 500 C portion of the Pt RTD type to drive a 4 to 20mA output range Zero Full Scale
62. pprovals Reliability Prediction Configuration Controls Two Wire RTD Transmitter w USB Electromagnetic Compatibility EMC Minimum Immunity per BS EN 61000 6 1 1 Electrostatic Discharge Immunity ESD per IEC 61000 4 2 2 Radiated Field Immunity RFI per IEC 61000 4 3 3 Electrical Fast Transient Immunity EFT per IEC 61000 4 4 4 Surge Immunity per IEC 61000 4 5 5 Conducted RF Immunity CRFI per IEC 61000 4 6 This is a Class B Product with Emissions per BS EN 61000 6 3 1 Enclosure Port per CISPR 16 2 Low Voltage AC Mains Port per CISPR 14 16 3 DC Power Port per CISPR 16 4 Telecom Network Port per CISPR 22 Safety Approvals UL Listed USA amp Canada Hazardous Locations Class l Division 2 Groups A B C D Hazardous Location or Nonhazardous Locations only These devices are open type devices that are to be installed in an enclosure suitable for the environment Consult Factory Electromagnetic Compatibility EMC CE marked per EMC Directive 2004 108 EC Consult factory MTBF Mean Time Between Failure MTBF in hours using MIL HDBK 217F FN2 Per MIL HDBK 217 Ground Benign Controlled GsGc 17231 0600 25 C 3 140 003 hrs 40 C 2 353 528 hrs Software Configuration Only via USB This transmitter produces an analog output current proportional to a sensor input based on the voltage measured across the sensor resistance No switches or potentiometers are used to make adju
63. ral purpose NEMA Type 1 enclosure Circuit Board Military grade fire retardant epoxy glass per IPC 4101 98 with humi seal conformal coating DIN Rail Mounting Unit is normally mounted to 35x15mm T type DIN rails Refer to the DIN Rail Mounting amp Removal section for more details Shipping Weight 0 5 pounds 0 22 Kg packed These limits represent the minimum requirements of the applicable standard but this product has typically been tested to comply with higher standards in some cases Operating Temperature 40 C to 80 C 40 F to 176 F Storage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 non condensing Isolation Input amp output are not isolated from each other for this model as this model is intended to interface with insulated or non grounded input sensors Installation Category Suitable for installation in a Pollution Degree 2 environment with an Installation Category Over voltage Category II rating per IEC 1010 1 1990 Operating Shock amp Vibration Immunity Sinusoidal Vibration 5G 5 500 Hz in 3 axis at 2 hours axis per IEC60068 2 6 Random Vibration 5G rms 5 500 Hz in 3 axis at 2 hours axis per EC60068 2 64 Mechanical Shock 30g at 11ms half sine shock pulses and 50g at 3ms half sine shock pulses in each direction along 3 axis 18 shocks per IEC60068 2 27 Acromag Inc Tel 248 295 0880 39 http www acromag com Model TT231 0600 Environmental Agency A
64. ransmitter to its loop calibrated in a safe area then power supply before connecting USB or erratic operation may result installed in the field which may be in a hazardous area Do not attempt to connect a PC or laptop to this unit while installed in a hazardous area as USB energy levels could ignite explosive gases or particles in the air IMPORTANT All USB logic signals to the transmitter are referenced to the potential of its internal signal ground This ground is also held in common with the USB ground and shield ground The potential of the transmitter s current output pin output minus relative to earth ground will vary according to the load current and load resistance net IR drop Without isolation this IR drop would drive a potential difference between the normally grounded current loop and the grounded USB connection at the PC causing a ground loop that would inhibit setup and calibration and may even damage the transmitter This is why an isolated USB connection is recommended Alternatively you could avoid the use of an isolator if a battery powered laptop was used to connect to the transmitter and the laptop has no earth ground connection either directly or via a connected peripheral Acromag Inc Tel 248 295 0880 11 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB CONFIGURATION SOFTWARE Quick Overview This transmitter can only be configured and calibrated via its Configuratio
65. stments to this transmitter Its analog output level and behavior is instead determined via register values stored in non volatile EEPROM memory in the transmitter The contents of these registers are automatically uploaded at power up and will determine excitation amplifier gain zero offset linearization and other options of the embedded ASIC The contents of these registers are programmed using a temporary USB connection to a host computer or laptop running a Windows compatible configuration software program specific to the transmitter model This software provides the framework for digital control of the contents of these registers All register information is stored in non volatile EEPROM memory except for Control Register 1 the Fault Status Register and the Checksum Register All control registers are read write capable except for the Fault Status Register Refer to Operation Step By Step in the Technical Reference section of this manual for detailed information on available software control of this model Acromag Inc Tel 248 295 0880 40 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Revision History The following table show the revision history for this document Release Date EGR DOC Description of Revision 01 JUNE 12 BC KLK Initial Acromag release 26 JULY 13 CAP ARP Added UL Mark to this model removed pending refer to ECN 13G017 for additional information Added note to USB connections drawi
66. t Ripple amp Noise Less than 0 1 of output span Note Additional filtering at the load is recommended for sensitive applications with high speed acquisition rates high frequency noise may be reduced by placing a 0 1uF capacitor directly across the load For excessive 60Hz supply ripple a 1uF or larger bulk capacitor is recommended at the load Output Ambient Temperature Effect The combined effect of zero and span drift over ambient temperature is better than 0 008 C of input span or 80ppm C for reference test conditions see Input Spec Output Resolution Not Applicable as input signal is not digitized The signal path is fully analog with digital controls for offset excitation and linearity The effective adjustment resolution is approximately 12 bits for reference test conditions Output Response Time For a step change in input signal the output reaches 98 of final value in less than 500us typical with a 250Q load Output Power Supply 9 32V DC SELV Safety Extra Low Voltage 30mA max The voltage level across the transmitter must not exceed 36V even with a shorted load The voltage level must be chosen to provide 20mA current to the load 0 020 R typical plus 8 6V minimum to the transmitter terminals plus any line drop Ideally your supply should additionally drive over scale and alarm current levels to the load alarm level is 1mA above the over scale threshold selected Reverse polarity protection is inherent as ou
67. ted range as shown It is generally better than 0 1 of span for ranges below 500 C and spans greater than or equal to 50 C For the Platinum RTD input type linearity and accuracy has been optimized for calibrated spans within the region of 50 to 500 C Accuracy is degraded for input spans less than 50 C and output spans less than 16mA Unit provides sensor excitation linearization lead wire compensation 3 wire and sensor fault lead break detection Consult factory for 10000 Pt RTD support Table 1 Input RTD Ranges and Accuracy 71385 1000 1385 IEC751 Amendment 2 1995 Pt3911 1000 1 3911 Old JIS 1981 35 http www acromag com Model TT231 0600 Input Two Wire RTD Transmitter w USB Notes Table 1 1Alpha a is used to identify the RTD curve and its value is derived by dividing the sensor resistance at 100 C boiling point of water minus the sensor resistance at 0 C freezing point of water by the sensor resistance at 0 C then by 100 C a R100 c Rovc Rovc 100 C For Pt 100Q this is 38 50Q 100 0Q 100 C or 0 00385Q Q C and represents the average change in resistance per C The Zero of the range is a fixed choice of 50 0 C or O F for 3 wire RTD The 2 wire RTD input uses a fixed zero of 0 C 3 Rated accuracy applies for input spans greater than 50 C or 8Q and with a 16mA output span Input Configuration Three wire w lead compensation four wire w 3 wire lead c
68. terface A Two Wire RTD Transmitter w USB Hardware uses digitally controlled 7 bits sign coarse amp fine DAC s with 256 steps of adjustment in each Zero code output level is 4 116mA Coarse adjustment is 0 029mA step with a typical coarse adjustment range from 3 77mA to 3 77mA at the output Fine adjustment is 0 0018mA step for an adjustment range of 236uA to 236uA at the output Output Full Scale Adjust 20mA nominal adjustable from 16 24mA Sets value corresponding to 100 of output and is adjusted independent of over range threshold Effective adjustment range is additionally limited via the configuration software Output Span 16mA nominal 4 20mA digitally adjustable Span adjust is determined by PGA gain and sensor excitation with 3 methods of digital adjustment PGA gain select reference current coarse adjustment and fine adjustment Span expressed as lo Vin from the PGA to the output amp has an adjustment range of 49 3mA V to 3150mA V Additionally the linear operating range of the output may be extended via the under scale and over scale threshold settings set separately Your effective adjustment range is additionally limited via the configuration software Output Fault Alarm Limits Downscale fault level is O 4mA below the selected under scale threshold typical Upscale fault level is 1 0mA above the selected over scale threshold typical The unit can be set for limits that comply with NAMUR NE43 recommendations
69. the Device Name scroll bar to select another unit discern unit by serial number Then click Open to communicate with it If you break the USB connection to a transmitter the software will automatically close the connection for you When you reconnect the cable you will have to click Open to reopen communication with the transmitter Open the Transmitter for Communication Once you have opened a transmitter for communication the device status will change from Ready to Connected and the transmitter ID information will be displayed in the Product Name Manufacturer and Serial Number fields At this point the connected transmitter is ready for configuration and the appropriate configuration fields become active and await your input If you want to see how the connected unit is already configured before changing its configuration click the Get Config button of the Configuration amp Calibration controls to retrieve its current configuration information Note the message bar at the bottom of the screen and it should display a message like Read Complete Normal Operation inputs in range IMPORTANT If you make any changes to the Configuration Parameters you will have to recalibrate the unit via the Start Calibration button in order to actually write those changes to the transmitter Select the Input Type In the Calibration section of this screen select an input type Platinum RTD or Resist
70. tp www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Configuration Note that without a device already connected via USB the Device Status field indicates Disconnected After you connect USB the first step to begin Configuration is to select the device to connect to using the scroll window of the Device Name field Use the scroll bar to click on and select a transmitter from this list in order to open it for reconfiguration use the serial number to discern a particular transmitter Then click the Open button to connect to the selected device If your transmitter was already connected via USB when you booted this software your screen will look more like the screen at right where the software has already initiated a connection to the transmitter for you see Device Connect area and note that Device Status indicates Connected Note that the software automatically opened the connection with the transmitter and Read Complete is indicated in the message bar at the bottom of the screen Additionally most fields and controls are not faded out and await your input Acromag Inc Tel 248 295 0880 After executing the Acromag Configuration software for this model a screen similar to the following will appear if you have not already connected to your transmitter via USB note some fields are faded out under these conditions Y Acromag T1231 Configuration Software Device
71. tput terminals are bridge coupled and not polarized output tpolarity labels of enclosure are for reference only CAUTION Do not exceed 36VDC peak to avoid damage to the unit Terminal voltage above 8 6V minimum must be maintained across the unit during operation Power Supply Effect Less than 0 001 of output span effect per volt DC change Output Compliance amp Load Resistance Equation 8 6V minimum transmitter Unit will drive 15V typical to the load with a 24V supply and 20mA loop current 7500 assuming negligible line drop Compute Rioad Max Vsupply 9V 0 020A for full scale output current assuming negligible line drop This does not account for over scale or alarm current levels and you should adjust the denominator in this expression for your particular alarm current level Output Load Resistance Effect Less than 0 005 of output span effect for 1000 change in load resistance Output Limiting Adjustable less than or equal to 30mA Limited to over scale and under scale threshold values that you configure Actual over under range limits are approximate and may vary between units Output Zero Adjust 4mA nominal adjustable from 3 5mA to 6mA Sets value corresponding to 0 of output and is adjusted independent of under range threshold Effective adjustment range is additionally limited via the configuration software Acromag Inc Tel 248 295 0880 37 http www acromag com Model TT231 0600 Output USB In
72. unit does convert under range and over range values outside of the 0 and 100 limits and this is set by separately selecting the output Under Over scale Thresholds Not all combinations of Input Zero and Input Full Scale will be possible The software may prompt you to make another selection Also if the input zero and full scale points are chosen too close together performance will be degraded A minimum span of 50 C is recommended Note that you will have to be able to precisely drive the corresponding input range resistance values for zero and full scale in order to calibrate your input range later Select the Output Range Zero and Output Range Full Scale In the Output Zero and Output Full Scale fields enter the output currents that are to correspond to 0 and 100 of output respectively This is typically 4mA and 20mA respectively but you could optionally specify an output zero from 3 5mA up to 6 0mA or an output full scale from 16mA up to 24mA Note that the output range over scale and under scale thresholds are specified separately and will determine the linear operating range of the output including possible over under range outside of these approximate limits If the output zero and full scale points are chosen too close together performance will be degraded Use input spans greater than 50 C Acromag Inc Tel 248 295 0880 18 http www acromag com Model TT231 0600 Configuration HELP You can press F1
73. ure 0 Manufacturer Acromag Inc Range 25 oc Current Output Serial Range 0000044 ma Measured Current Output Start Calibration Under Over Scale Thresholds Under Range Value URV Unit Status Get Config Fault Status No Faults Read Status Reset Unit Sensor Fault Break Detection ODownscale URV 0 4mA 2 26 mA 21 75 C Min 226 m gt Upscale ORY 1 0mA Submit Break Detection Factory Settings Restore Factory Settings Read Complete Direction Over Range Value ORY Value 30 34 mA 329 25 C Min 22 43 mA Submit U O Configuration Device Connect First Connect to Unit Here e Scan for connected transmitters and open communications with them e Display the model serial number Product Name Manufacturer and Serial Number of the connected transmitter This section is used to scan for connected transmitters select a connected transmitter open communications with it and close connections with it Device connection Status is also indicated here along with the connected transmitter s ID info Product Name serial Manufacturer amp Serial Number Configuration Calibration Next Configure Unit Then Calibrate I O e Optional Read the unit s current configuration with Get Config button e Set the Input Type Platinum RTD or Resistance e Set the input wiring to Two wire or Three Four wire sensor connections e Set the alpha coefficient
74. ut temperature not the input resistance If your output appears imprecise you may need to repeat calibration but being very careful to take accurate measurements and enter the measured output currents correctly and using milliamps as your units Make sure that you carefully drive the precise input signal resistances necessary for calibration If measuring voltage across the output load resistance make sure that you use the exact input resistance when calculating the current measured Also make sure that you have an adequate input span as too tight input spans will magnify error 21 http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Pt RTD Resistance Versus Temperature Table Refer to the following table when using a resistance substitution box to drive the input zero and full scale signals This contains the resistance values for the two most common Pt RTD alpha types Optionally you can determine resistances using an online calculator based on a different reference standard For example try the calculators at http www minco com tools sensorcalc Platinum RTD Resistance Versus Temperature Note For Pt385 Platinum alpha Temperspurein bm 0 003850 0 2C using the TEMP European curve reference ITS 90 C Ce Platinum Apha S EE ee Get er er 20 LI soar LI am Tf pha a is used to identify the by dividing the sensor resistance at 100 boiling point of ET 2 i LI wA minus the sensar r
75. ve feedback from the input signal to produce a system response that is also nearly quadratic but curving in the opposite direction producing a net response that is very linear This DAC allows the nonlinearity error to be calibrated out by modulating the excitation current with the input signal of the RTD during calibration producing a nearly 40 1 improvement in linearity The adjustment range of this linearity correction is set via the 15 8K Rlin resistor which has been optimized for increased accuracy for the most common spans that occur between 50 C and 500 C The PGA includes a zero DAC that allows the magnitude of the zero output current to be precisely adjusted near 4mA The output voltage of the PGA voltage amplifier is converted to current through a 6 34K Rvi resistor at its output just prior to the current amplifier that drives the output loop The current gain of this output current amplifier is 50x Note that the output loop is bridge coupled to the transmitter making the transmitter output polarity insensitive The USB port ground is common to the circuit ground The USB port ground of most PC s is common to the USB cable shield and earth ground The output current loop is typically earth grounded at the loop supply minus connection For this reason it is recommended that USB signals be isolated when connected to a PC to prevent a ground loop from occurring between the PC earth ground and the traditional current loop earth groun
76. y done during reconfiguration http www acromag com Model TT231 0600 Two Wire RTD Transmitter w USB Service amp Repair Assistance This unit contains solid state components and requires no maintenance except for periodic cleaning and transmitter configuration parameter zero and full scale verification The enclosure is not meant to be opened for access and can be damaged easily if snapped apart Thus it is highly recommended that a non functioning transmitter be returned to Acromag for repair or replacement Acromag has automated test equipment that thoroughly checks and calibrates the performance of each transmitter and can restore firmware Please refer to Acromag s Service Policy and Warranty Bulletins or contact Acromag for complete details on how to obtain repair or replacement Acromag Inc Tel 248 295 0880 33 http www acromag com Model TT231 0600 ACCESSORIES Two Wire RTD Transmitter w USB Software Interface Package Le romi USB Isolator USB A B Cable V USB A mini B Cable Software Interface Package Configuration Kit Order TTC SIP USB Signal Isolator USB A B Cable 4001 112 USB A mini B Cable 4001 113 Configuration Software CDROM 5040 944 This kit contains all the essential elements for configuring TT230 amp TT330 family Transmitters Isolation is recommended for USB port connections to these transmitters and will block a potential ground loop between your PC and a groun

8500935C TT231-0600 User`s Manual

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